I'm quite happy with the Reborn 2, it offers a very good package for the price. It should had come with auto-leveling and air filters has an option to not rise the price and Flying Bear should include a couple of nylon washers to put between the z axis couplers and steppers or a better coupler. Also the top cover should be transparente and with better design.
It was well packed and without any damage, the youtube mounting instructions are quite good but I can't say the same for the software configuration, It would be important to have a video instructions on how to configure your printer on Cura in english or they should supply testing printers to more English speaking youtuber's.
The communication with Flying Bear support and sale has worked well.
I didn't had the time to calibrate my machine but out of the box the printings are already ok.